Crock-press



(No Model.)

W. H. BOOK, Jr. 011001: PRESS.

No. 586,291. Patented July 13', 1897.

Wiiness e s: Invenfor 2 y ZZiCIZI 0 0k J5":

UNITED STATES PATENT OFFICE.

WILLIAM 11. BOOK, JR, or SUMMIT, 01110, ASSIGNOR TO'TAPLIN, RICE & 00.,OF AKRON, 01110.

CROCK-PRESS.

SPECIFICATION forming part of Letters Patent N 0. 586,291, dated July13, 1897.

Application filed December 21, 1896. Serial No. 616,455- (No model.)

To aZZ whom it may concern.-

Be it known that 1, WILLIAM H. Book, J r. t citizen of the UnitedStates, residing at Akron, in the county of Summit and State of Ohio,have invented a certain new and useful Improvement in Crock-Presses, ofwhich the following is a specification.

My invention relates generally to presses wherein the body of the crockis formed by forcing the clay while in a plastic state through anannular orifice; and it has especial relation to that class ofcrock-presses in which the tube of clay which is to constitute the bodyof the crock encounters at the point of issuance a plate of claysupported by a suitable platen to form a bottom for the vessel and withwhich plate of clay it forms a union by pressure.

In operation some difficulty is found in always securing a firm jointbetween the body and the bottom and also in causing the bottom toseparate from the bottom of the mandrel that forms the hollow of thecrock-body and from the platen that carries it to the point of union.

The objects of my invention are to secure a more perfect union betweenthe body and the bottom and to provide'means for causing a freeseparation of the crock-bottom from the end of the mandrel and from theplaten that carries it.

To the aforesaid objects my invention consists in the peculiar and novelconstruction, arrangement, and combination of parts hereinafterdescribed, and then specifically pointed out in the claims, referencebeing had to the accompanying drawings, forming a part of thisspecification.

In the accompanying drawings, in which similar letters of referenceindicate like parts in both views, Figure 1 is a central verticalsection of the lower end or die of a crock-press illustrating myinvention, and Fig. 2 a view of the concavo-convex plate hereinafterreferred to.

Referring to the drawings, A is the cylinder of a sewer-pipe orcrock-forming press, in which the plastic clay is placed to be forceddown by a piston, (not shown,) and B is the head, constituting thetapering discharge, the

smaller end being of proper diameter to form the outside of thecrock-body, and inside of the latteris suspended the mandrel O to formthe interior of said crock-body.

About the outside of the smaller end of the head B is a groove in whichfits a fiange'D, that projects from the inside of each half of a severedring E, that has an internal configuration to form the crock-rim and theout side of the crock-body. Below this ring E is a platen F, mounted ona shaft G in alinement with the axis of the press and adapted to beraised to and lowered from the severed ring E, and by means of anannular tongue and groove to be held firmly from lateral displacement,and in operation is provided with a locking device to retain it firmlyagainst the ring while the body is being united with the bottom, but asthese locking devices are located centrally at the front and back of theapparatus and as they are common devices well known to persons skilledin the art it is not feasible to show them nor regarded as essential toa correct understanding of the invention.

On the under face of the mandrel O is a thin metallic plate H, thataccurately fits said face and has its edges rounded or otherwise formedso. as to present a smooth joint therewith. This plate is concavo-convexand is placed with its concave side toward the mandrel and is held by asliding bolt I, that permits it, when not forced upward, to maintain itsnormal shape, with its edges touching the end of the mandrel.

The platen F has a shallow recess in which fits a free metallic plate J,also conforming with the platen, to form a mold for the crockbottom. Toadjust this plateJ accurately in place and to retain it when soadjusted, I employ a circular block K, centrally fastened to the plateand adapted to enter a corre sponding recess in the platen F.

In the bottom of the mandrel are a series of holes L, and in the platenF two series of holes M N, each series preferably in a circleequidistant from the center of the part through which they pass and eachseries for a distinct purpose to be stated.

In operation a sheet of plastic clay is placed in the platen F and theplaten raised and locked against the severed ring E, which has beenalready locked in place. The clay-tube in the dies being forced downencounters the sheet of clay in the platen, and the pressure beingcontinued, part of the clay in the sheet escapes through the holes N,being forced out,

and its placesupplied by clay from the tube in the press, therebyclosely commingling the two and practically fastening them at intervalslike dowel-pins.

' entrance of the block K unless the plate J be removed j ust before thelast operation. Pressure being again applied in the cylinder A thecrock-body issues from the press, the platen carrying the bottomdescending with it. As it commences to descend the plate H springsdownward with it, resiliency thereby pushing the central part of thecrock-bottom with it until suddenly arrested by the bolt I with a shockor jar that causes it to separate from the plastic crock-bottom, airentering between the plate H and the bottom of the mandrel through theholes L to avoid a vacuum between these parts. The pressure is continueduntil the desired length of crock is obtained,

when it is arrested, the severed ring E unlocked and opened, and thecrock out from the mass of clay above at the line of the bottom of thedie B. The platen F, with followboard and crock, is then lowered untilthe crock is free from the press, when it is lifted The platen is thenunlocked by a partial rotation which shears the clay in the holes N fromthe crock, leaving the bottom smooth at that line and the platenlowered, the plate J adhering to the crock,

ofi, and the press is ready to repeat the operation.

In practice I prefer to crown the lower surface of the mandrel Oslightly downward, so that the space between the disks H and K isnarrower at the center under the bolt I than at the outer edges.

I claim as my invention 1. In a crock-press of the class designated, thecombination with the mandrel of the press, of a concave-convex plate,with the concave face toward the bottom of the mandrel and its edge incontact therewith and a sliding bolt arranged to permit said plate toretain its normal shape until compressed by force from its opposite sidesubstantially as shown and described and for the purpose specified.

2, The combination with the bottom of the mandrel; the concave-convexplate, and the sliding bolt; of the vent-holes in said mandrel-bottom topermit the entrance of air be tween said parts, substantially as shownand described.

3. In a crock-press of the kind specified,the combination with the outerdie and mandrel, and the bottom-carryin g platen and the ventholes inthe mandrel-bottomand platen; of a concave-convex plate with its concaveside to said mandrel-bottom and a .sliding bolt, arranged to hold itsedges normally in contact with said bottom; and a free plate adapted tofit and rest in said platen; all constructed and arranged to coact,substantially in the manner and for the purpose specified.

In testimony that I claim the above I hereunto set my hand. I I

WILLIAM H. ROOK, J

It is hereby certified that the residence of the patentee in LettersPatent No. 586,291

granted July 13, 1897, upon the application of William H. Book, J r.,for an improvement in Crock-Presses, was erroneously written in thegrant and printed at the head of the specification Summit, Ohio, whereassaid name should have been written and printed Akron, Ohio, and that thesaid Letters Patent should be read with this correction therein that thesame may conform to the record of the case in the Patent Oflice.

Signed, countersigned, and sealed this 20th day of July, A. D. 1897.

[SEAL] WEBSTER DAVIS,

Assistant Secretary of the Interior. Oountersigned V A. P. GREELEY,

Acting Commissioner of Patents.

